流體化床燃燒爐中煤與液體燃料混燒之研究

近年來，能源回收是處理廢棄物的方式之一，而大部分處理對象是固體廢棄物，關於液體廢棄物之處理報告則少之又少，且液體與固體之燃燒行為有所不同，以此研究探討了解其燃燒行為及汙染物排放情形。本研究之實驗皆於0.8 m長×0.4 m寬×4.7 m高之先導型渦旋式流體化床中進行，在固定總釋熱量130,000 kcal/hr的情況下，以廢液、痲瘋籽油及煤炭為進料，一次風總風量3 Nm3/min，過量空氣50%，改變床溫、液體燃料比例及粒徑大小，探討操作條件對爐溫、床內燃燒份額及氮氧化物排放的影響。實驗結果顯示，床內燃燒份額在固液混燒的情況下，會隨床溫增加而增加，但隨著液體比例增加而減少。氮氧化物的排放濃度隨床溫增加而增加，但隨著液體燃料的增加，須視液體內氮含量多寡才能推斷結果，若液體燃料之氮含量較煤炭多，氮氧化物排放量會越來越多；反之，則越來越少。

關鍵字

煤；廢液；流體化床燃燒爐；混燒；氮氧化物排放

並列摘要

In recent years, energy recovery is one of methods for waste disposal, and the focus is mostly laid on the solid waste. However, the reports on the treatment of liquid wastes are very few, and the behavior of liquid wastes during combustion is differed from that of solid waste. This study is to investigate the behavior and pollutant emissions during co-combustion of coal and liquid fuel. Experiments in this study are carried out in the pilot-scale vortexing fluidized bed which is 0.8 m length × 0.4 m width × 4.7 m height. In the case of fixed total heat release(130,000 kcal/hr), using liquid waste, jatropha oil and coal as fuel. Total primary air is 3 Nm3/min and excess air is 50%. The bed temperature and liquid-fuel ratio are adjusted to explore the effect of operating conditions on the temperature of furnace, combustion fraction and NOx emissions. The results show that the in-bed combustion fraction in the case of co-combustion of solid and liquid increases with the bed temperature, but decreases with the ratio of the liquid increases. The NOx emissions increases with bed temperature. As the liquid fuel increases, depending on the amount of nitrogen content, the results varied; if the nitrogen content of the liquid fuels is higher than that of the coal, nitrogen oxide emissions will increase accordingly, and vice versa.

並列關鍵字

coal ； recycle fuel ； fluidized bed combustor ； co-combustion ； NOx emission

參考文獻

Anthony, D. B. and J. B. Howard, “Coal Devolatilization and Hydrogasification, ” AIChE J. 22, 625-656 (1976).

Anthony E. J., D. Y. Lu and J.Q. Zhang, “Combustion Characteristics of Heavy Liquid Fuels in a Bubbling Fluidized Bed, ” Journal of Energy Resources Technology. 24(1), 40-46 (2002).

Atimtay, A. T., “Combustion of Volatile Matter in Fluidized Beds, ” J. R. Grace and J. M. Matsen, Eds., Plenum 159-166 (1980).

Atimtay, A. T., “Combustion of Volatile Matter in Fluidized Beds, ” Ind. Eng. Chem. Res. 26(3), 452-456 (1987).

Beacham B. and A. R. Marshall, “Experiences and results of fluidized bed combustion plant at Renfrew, ” Journal of the Institute of Energy. 52, 59-64 (1979).

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流體化床燃燒爐中煤與液體燃料混燒之研究

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